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Defined Benefit and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit | For all plans, the components of net periodic benefit for the three months ended September 30, 2023, and 2022 are as follows:
| Pension |  | Postretirement
(in millions) | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | — |  |  | $ | — |
Interest cost | 0.5 |  |  | 0.2 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (0.8) |  |  | (0.8) |  |  | — |  |  | — |
Amortization of prior service cost | (0.1) |  |  | (0.1) |  |  | (0.3) |  |  | (0.3) |
Amortization of net (gain) loss | — |  |  | 0.3 |  |  | (0.2) |  |  | — |
Net periodic expense (benefit) | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | (0.3) |  |  | $ | (0.1) |
For all plans, the components of net periodic benefit for the nine months ended September 30, 2023, and 2022 are as follows:
| Pension |  | Postretirement
(in millions) | 2023 |  | 2022 |  | 2023 |  | 2022
Service cost | $ | 1.4 |  |  | $ | 1.7 |  |  | $ | — |  |  | $ | 0.1 |
Interest cost | 1.6 |  |  | 0.6 |  |  | 0.6 |  |  | 0.5 |
Expected return on plan assets | (2.4) |  |  | (2.3) |  |  | — |  |  | — |
Amortization of prior service cost | (0.5) |  |  | (0.5) |  |  | (0.8) |  |  | (0.8) |
Amortization of net (gain) loss | — |  |  | 0.7 |  |  | (0.5) |  |  | — |
Net periodic expense (benefit) | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | (0.7) |  |  | $ | (0.2) |
Expected Contributions to Pension and Postretirement Plans | We expect to contribute the following to our pension and postretirement plans:
(in millions) | Pension |  | Postretirement
Expected contributions in 2023 | $ | 2.6 |  |  | $ | 1.5 |
Amounts contributed during the nine months ended September 30, 2023 | $ | 2.1 |  |  | $ | 1.4 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-2 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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